I’ve partied hard in my day so I can understand your situation. The longer you do it the more permanent it may become. So stopping sooner was a good choice. Your brain can sometimes repair itself, it’ll just take a while and a lot of self care and healthy behaviours. There’s no point in shaming yourself here either. Are you experiencing any other symptoms that correlate with your stuttering? Was it bad during use or did it get worse after you stopped?